Neomycin sulfate is the sulfate salt of neomycin B and C, which are produced
by the growth of Streptomyces fradiae Waksman (Fam. Streptomycetaceae).
It has a potency equivalent of not less than 600 ?µg of neomycin standard per
mg, calculated on an anhydrous basis. The structural formulae are:

Polymyxin B sulfate is the sulfate salt of polymyxin B1 and B2,
which are produced by the growth of Bacillus polymyxa (Prazmowski) Migula
(Fam. Bacillaceae). It has a potency of not less than 6,000 polymyxin B units
per mg, calculated on an anhydrous basis. The structural formulae are:

Hydrocortisone acetate is the acetate ester of hydrocortisone, an anti-inflammatory
hormone. Its chemical name is 21-(acetyloxy)- 11?,17-dihydroxypregn-4-ene-3,20-dione.
Its structural formula is: